County soil attribute survey sample point layout method based on composite type unit

Abstract

Aiming at the problems of poor representativeness of soil attribute investigation sample points, spatial variability of sample point density and soil attribute, unclear relationship with investigation granularity and precision requirements and the like in the existing method, the invention provides a county soil attribute investigation sample point arrangement method based on a composite type unit, and belongs to the field of soil resource investigation and research. According to the method, a soil composite type landscape unit vector diagram is constructed in real time according to the granularity requirement of soil classification investigation to obtain a characteristic landscape index value, so that the spatial variability of soil attributes to be inspected in each composite type landscape unit and the number of investigation sample points meeting the precision requirement are calculated; and soil survey sample points are randomly and uniformly distributed by utilizing the spatial distribution pattern of the composite type landscape units, so that geographic and attribute space full coverage of the soil survey sample points is realized, the requirements of preset soil survey granularity and precision are met, and the quality and efficiency of soil survey are improved.

Description

[0001]First, technical field[0002]The present invention is a sample method for the premium of the county soil attribute survey by the composite type soil landscape unit space distribution pattern. Specifically, according to the granularity and accuracy requirements of the soil, the characteristics of the corresponding particle size composite type soil landscape unit vector distribution map acquisition characteristics The landscape index value, and uses this to predict the spatial variability of the soil survey attribute, and then calculate the number of samples required for different soil properties to meet the requirements of the investigation accuracy, and finally according to the Soil Compound Type Space Distribution Pattern, randomly and uniformly set the soil survey sample. Methods belong to the field of soil resource survey research.[0003]Second, background technology[0004]The design method of scientific reasonable soil sample investigation program is of great significance for...

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Problems solved by technology

Obviously, directly using the spatial variation information of the soil attributes to be investigated should be the best method for sample point layout, but there is no way to obtain the spatial variation information of the soil attributes to be investigated for areas lacking prior information; even if you have soil The prior information of the properties to be investigated, but the prior information is also time-sensitive. As time goes by, the gap between the reality and the reality will gradually increase, and there will be obvious deviations between the design plan of the sample point and the reality. The best method is still in vain

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